That's interesting... What made you decide to put a cover on your fuel cooler? Cold climate? :dunno: If it is, I'm SOL livin in the warm tropics. Sounds like an inexpensive way to get 2mpg, especially with the high ULSD prices these days.

Here's a:bump: for ya, I'd like find out more as well.

 

Bump, I am very interested on this too

 

The warmer the fuel the less you use, better millage. The colder the fuel the more you use. More power. I would Just like to know why they put the cooler on the truck? IMO it is to help with the HP ratings.

 

Got a pic of your cover? Right now I need better mileage more than power. I am considering doing the tuner/dpf delete very soon, more for mileage but the power would be fun to play with.

 

Ford sez, From their 2008 fleet manual.

"A water cooled, heat exchanger for fuel cooling
and an electric pump system helps maintain
optimum fuel density."

Sounds like for more consistant power in hot weather.

 

This explains it all I guess I won't be covering it up!

• An independent active fuel cooling system is
used with the 6.4L Power Stroke® engine to help
maintain fuel density to the injectors and provide
fuel pump lubrication. Fuel cooling is
required due to the engine’s new High Pressure
Common Rail (HPCR) fuel supply system.
• An electric pump circulates coolant through the
water-to-fuel cooler. The coolant is cooled by
passing through an independent front mounted
radiator. The Engine Control Module (ECM)
causes the pump to operate when the fuel temperature
exceeds a preset limit.
• The vehicle must not be operated without a
properly functioning fuel cooling system.

 

Thank you for the info.

 

Should all the trucks have a fuel cooler then? Or are the injectors the reason why? U would think that all the trucks would have the same prob.

 

I believe all 6.4's have the cooler. I seem to recall reading somewhere that the pressure on the new common rail is something crazy like 28,000 psi and that's a big part of the heat build up. The new high pressure rail is a HUGE reason why the new diesels are so quiet .

For comparison a normal gas fuel rail runs between 32-38 psi for a return style system and approx. 63-67 psi for a return-less system.

 

jordanbellingham -- is that 2008 fleet manual you are quoting from available online anywhere?

thanks
brian

 

The fuel is used for lubrication in the high pressure injection pump.

Overheated fuel will not provide proper lubrication to the injection system and will damage the pump in short order.

I would strongly advise not blocking off the cooler radiator; this will impact the entire injection system in both a physical and electronic manner.

 

U are right. Not good! It did help on the below 0 days, the colder it got the worse my mpgs got so the winter cover did the same thing. I could tell the difference in millage with it on and with it off.
ps matt I am looking forward to your delete which im on the list for. Thanks